Please help with this statistics question?

Posted on 2016-03-26 14:48:00 in Statistics by STEN

In order to find out the current average age at which people buy their first home, 50 different estate agents are approached and each of these asked to supply information on a random selection of first time house purchasers. Information from a total of 350 first time house purchasers is obtained. The average age of these 350 purchasers is 29.5 years. In this scenario, the variable of interest is 
A. number of house purchasers per estate agent 
B. number of estate agents 
C. age of first house purchase 
D. age of estate agent 
E. number of people buying their first house

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